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Temperature measurement on 250V terminal

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Hi,

 

We have a cRIO system with a NI9213 temperature measurement module. We use type T thermocouples. 

 

All measurements work fine and are calibrated with aceptable results. But we when we measure on a live terminal that has up to 250 V L-N on it, we get disturbance on all channels and bad readings. How can we mitigate this to still measure on the live part?

 

/Mats

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